Water-Quality Assessment of the Sacramento River
Basin, California: Water-Quality, Sediment and Tissue
Chemistry, and Biological Data, 1995-1998
(Open-File Report 2000-391)

Quality Control
Blank Data: Surface Water

Total mercury and methylmercury in unfiltered water

Number of significant figures do not reflect analytical method
reporting levels.

[ng/L - nanograms per liter, < - less than]

Type of Blank	Date	Mercury or Methylmercury (ng/L)
Trip Blank - Total mercury	Feb-96	0.09
Field Blank - Total mercury	Feb-96	0.08
Trip Blank - Total mercury	Jul-97	0.16
Field Blank - Total mercury	Jul-97	0.31
Field Blank - Total mercury	Jan-98	0.03
Field Blank - Total mercury	Apr-98	0.04
Field Blank - Methylmercury	Apr-98	<0.048